Where are torsional shear bolts mainly used?

As a representative of high-strength fasteners, torsional shear bolts play a key role in steel structure engineering with their unique broken neck groove design and precise preload control.

The double nut structure of torsional shear bolts is combined with plum head tightening tools. When splicing steel box girders of large bridges, construction workers can complete tightening and quality inspection simultaneously by cutting off the broken ring after reaching the set torque with an electric wrench, greatly improving construction efficiency.

In the node connection of high-rise building steel frames, torsional shear bolts transfer loads through friction-type connections. After sandblasting, the friction coefficient of the contact surface reaches more than 0.45, ensuring the anti-slip performance in seismic design.

The high-speed rail carriage chassis assembly in the rail transit field uses 12.9-grade torsional shear bolts. Its fatigue resistance can cope with high-frequency vibration environments, and the application of anti-loosening coatings further ensures long-term operational stability.

In the flange connection of wind turbine towers, torsion shear bolts with a diameter exceeding M36 are used in conjunction with hydraulic tensioners to overcome the preload loss caused by thick plate lamination and ensure the structural integrity of megawatt-class units under extreme wind loads.

In shipbuilding, galvanizing or Dacromet treatment is used to improve salt spray corrosion resistance and achieve maintenance-free tightening during deck machinery installation.

When assembling precision equipment such as CNC machine tool beds, micro torsion shear bolts are used for modular connection. Their precise axial force control avoids deformation errors caused by assembly stress.

In the positioning of body welding fixtures on automobile production lines, the quantitative tightening characteristics of torsion shear bolts are used to ensure multi-station repeated positioning accuracy. During the construction process, the torque-angle composite control method is used for quality acceptance. The bolt head after the neck is broken forms a permanent anti-counterfeiting mark, which effectively eliminates the hidden danger of leaking. This self-checking design makes it the preferred tightening solution in the ISO certification system.